Helicone

Helicone has a free Hobby plan with 10,000 requests, and paid plans start at $20 per seat per month.

Helicone is an open-source LLM observability platform that helps developers monitor, debug, and improve AI apps.

The free tier gives you a requests view and a dashboard, which is enough to see how an early project behaves.

Pro is the starter plan for teams: it goes past 10k requests with usage-based pricing, adds core observability features, and comes with standard support.

Team costs $200 per month, includes unlimited seats, everything in Pro, plus prompts, experiments and evals, SOC-2 compliance, HIPAA, and a dedicated Slack channel.

Enterprise is custom-priced and adds a custom MSA, SAML SSO, on-prem deployment, and bulk cloud discounts.

Note that Pro charges per seat, so cost grows with team size.